Abstract: An indicator circuit comprises a first logic circuit, a second logic circuit, a third logic circuit, an auxiliary power circuit, a switch circuit, and a light emitting diode (LED) circuit. The switch circuit controls whether the LED circuit lights or not, according to the first logic circuit, the second logic circuit, and the third logic circuit, to indicate connections to different data bandwidths.

Abstract: An indicator circuit comprises a first logic circuit, a second logic circuit, a third logic circuit, an auxiliary power circuit, a switch circuit, and a light emitting diode (LED) circuit. The switch circuit controls whether the LED circuit lights or not, according to the first logic circuit, the second logic circuit, and the third logic circuit, to indicate connections to different data bandwidths.

Abstract: A network communication device for generating dying gasp signals includes a voltage detection circuit, a charging and discharging circuit, a power supply circuit, a central processing unit (CPU), a load circuit, an over-heating detection circuit, and an over-heating protection circuit. The CPU includes a dying gasp detection pin connected to the voltage detection circuit to retrieve a detected voltage of an external power supply, and determines whether the external power supply is off according to the detected voltage, and generates dying gasp signals upon the condition that the external power supply is off. The over-heating protection circuit changes voltage of the dying gasp detection pin of the CPU to make the CPU to generate the dying gasp signals and to turn off the load circuit and the power supply circuit upon the condition that the over-heating detection circuit determines that the network communication device overheats.

Abstract: A network communication device for generating dying gasp signals includes a voltage detection circuit, a charging and discharging circuit, a power supply circuit, a central processing unit (CPU), a load circuit, an over-heating detection circuit, and an over-heating protection circuit. The CPU includes a dying gasp detection pin connected to the voltage detection circuit to retrieve a detected voltage of an external power supply, and determines whether the external power supply is off according to the detected voltage, and generates dying gasp signals upon the condition that the external power supply is off. The over-heating protection circuit changes voltage of the dying gasp detection pin of the CPU to make the CPU to generate the dying gasp signals and to turn off the load circuit and the power supply circuit upon the condition that the over-heating detection circuit determines that the network communication device overheats.